Let us call them shutter 1 and shutter 2. The remote control for shutter 1 controls shutter 1 and shutter 2 while the remote control for shutter 2 only controls shutter 2.Take the remote control for shutter 2 and press the PROG button on the rear for 3 seconds until shutter 2 makes an up and down movement. Then take the remote control for shutter 1 and press the PROG button on the rear for 1 second (shutter 2 makes another up and down movement)You now have one remote control per shutter.